Left panel: median number of particles per host halo vs. the median host mass for Symphony (stars) and a representative sample of existing cosmological zoom-in simulation suites (markers). The five Symphony suites presented in this work are: LMC (magenta), Milky Way (blue), Group (green), L-Cluster (gold), and Cluster (red); Symphony resimulation suites are shown as small unfilled stars. Existing zoom-in suites with (without) hydrodynamic resimulations are shown in black (gray). Median host masses and particle counts are taken from each existing suite without converting to a unified virial mass definition. Host-to-host scatter for suites with multiple simulations is not shown. See Appendix A for references. Right panel: number of host halos per zoom-in suite vs. the median number of particles per host. Only target host halos are included in the y-axis counts; however, many zoom-ins (including those in Symphony) often contain halos of similar masses in addition to the host in the highest-resolution region. The black line shows the cumulative number of zoom-in simulations combined over all five fiducial-resolution zoom-in suites in the Symphony compilation, i.e., N _host( > N _part,host). Note that the Group point along the cumulative line is offset vertically from the Group suite for visual clarity.